<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>devtools-detector in iframe</title>
    <style>
      .iframe {
        display: block;
        width: 800px;
        height: 800px;
        border: 2px solid red;
        margin: 0 auto;
      }
    </style>
  </head>

  <body>
    <iframe class="iframe" src="./normal.html" frameborder="0"></iframe>
  </body>
</html>
